Alan Cox wrote:
> > Are you saying that the line discipline's write_wakeup should be a
> > simple function to queue the line discipline's BH (that's what "wakeup"
> > means to me), or that write_wakeup must be called from BH context by the
> > serial driver?
>
> Take a look at the transmit interrupt handling in the serial.c code. The
> irq code polls the THRE bit and if it indicates room it stuffs bytes down
> the pipe
>
> If the internal buffer is empty it wakes up a task queue on tq_serial. The
> bh context code calls the ldisc wakeup
I wasn't asking what serial.c does, I was asking if the line
disciplines are allowed to assume they'll always be called that way :-)
- Jamie
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